如果当前字母的下标和字符串的长度相等，那么这个变量是一个空字符串。
If the index of the current letter is equal to the length of the string, this variable is an empty string.
刚才我写的这些下标，只是标记一下，这是常变量。
Just I have put these extra subscripts to tell us what is held constant and what isn't.
读写前一步长下的时间在表5.2.1里的宏中加入下标_M1就可以得到前一次步长时间下（t-⊿t）的变量的值。
The M1 suffix can be generally applied to the macros in Table 5.2.1 to allow access to the value of the variable at the previous time step (i. e.
要保存的值可以是数值或字符串，每个值有其唯一的下标，并且按顺序存放在数组变量中。
The values can be Numbers or strings. A key or subscript value is automatically assigned, and the values are kept in the order entered.
要保存的值可以是数值或字符串，每个值有其唯一的下标，并且按顺序存放在数组变量中。
The values can be Numbers or strings. A key or subscript value is automatically assigned, and the values are kept in the order entered.
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